libguile/error.c

   1 /*      Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45 #include "pairs.h"
  46 #include "genio.h"
  47 #include "throw.h"
  48
  49 #include "error.h"
  50
  51 #ifdef HAVE_UNISTD_H
  52 #include <unistd.h>
  53 #endif
  54 \f
  55
  56 \f
  57 /* {Errors and Exceptional Conditions}
  58  */
  59
  60
  61 extern int errno;
  62
  63 void (*scm_error_callback) () = 0;
  64
  65 /* All errors should pass through here.  */
  66 void
  67 scm_error (key, subr, message, args, rest)
  68      SCM key;
  69      char *subr;
  70      char *message;
  71      SCM args;
  72      SCM rest;
  73 {
  74   SCM arg_list;
  75   if (scm_error_callback)
  76     (*scm_error_callback) (key, subr, message, args, rest);
  77
  78   arg_list = scm_listify (subr ? scm_makfrom0str (subr) : SCM_BOOL_F,
  79                           message ? scm_makfrom0str (message) : SCM_BOOL_F,
  80                           args,
  81                           rest,
  82                           SCM_UNDEFINED);
  83   scm_ithrow (key, arg_list, 1);
  84
  85   /* No return, but just in case: */
  86
  87   write (2, "unhandled system error\n",
  88          sizeof ("unhandled system error\n") - 1);
  89   exit (1);
  90 }
  91
  92 /* Scheme interface to scm_error.  */
  93 SCM_PROC(s_error_scm, "scm-error", 5, 0, 0, scm_error_scm);
  94 SCM
  95 scm_error_scm (key, subr, message, args, rest)
  96      SCM key;
  97      SCM subr;
  98      SCM message;
  99      SCM args;
 100      SCM rest;
 101 {
 102   SCM_ASSERT (SCM_NIMP (key) && SCM_SYMBOLP (key), key, SCM_ARG1, s_error_scm);
 103   SCM_ASSERT (SCM_FALSEP (subr) || (SCM_NIMP (subr) && SCM_ROSTRINGP (subr)),
 104               subr, SCM_ARG2, s_error_scm);
 105   SCM_ASSERT (SCM_FALSEP (message)
 106               || (SCM_NIMP (message) && SCM_ROSTRINGP (message)),
 107               message, SCM_ARG3, s_error_scm);
 108
 109   SCM_COERCE_SUBSTR (message);
 110
 111   scm_error (key,
 112              (SCM_FALSEP (subr)) ? NULL : SCM_ROCHARS (subr),
 113              (SCM_FALSEP (message)) ? NULL : SCM_ROCHARS (message),
 114              args,
 115              rest);
 116   /* not reached.  */
 117 }
 118
 119 SCM_SYMBOL (scm_system_error_key, "system-error");
 120 void
 121 scm_syserror (subr)
 122      char *subr;
 123 {
 124   scm_error (scm_system_error_key,
 125              subr,
 126              "%s",
 127              scm_listify (scm_makfrom0str (strerror (errno)),
 128                           SCM_UNDEFINED),
 129              scm_listify (SCM_MAKINUM (errno), SCM_UNDEFINED));
 130 }
 131
 132 void
 133 scm_syserror_msg (subr, message, args, eno)
 134      char *subr;
 135      char *message;
 136      SCM args;
 137      int eno;
 138 {
 139   scm_error (scm_system_error_key,
 140              subr,
 141              message,
 142              args,
 143              scm_listify (SCM_MAKINUM (eno), SCM_UNDEFINED));
 144 }
 145
 146 void
 147 scm_sysmissing (subr)
 148      char *subr;
 149 {
 150 #ifdef ENOSYS
 151   scm_error (scm_system_error_key,
 152              subr,
 153              "%s",
 154              scm_listify (scm_makfrom0str (strerror (ENOSYS)), SCM_UNDEFINED),
 155              scm_listify (SCM_MAKINUM (ENOSYS), SCM_UNDEFINED));
 156 #else
 157   scm_error (scm_system_error_key,
 158              subr,
 159              "Missing function",
 160              SCM_BOOL_F,
 161              scm_listify (SCM_MAKINUM (0), SCM_UNDEFINED));
 162 #endif
 163 }
 164
 165 SCM_SYMBOL (scm_num_overflow_key, "numerical-overflow");
 166 void
 167 scm_num_overflow (subr)
 168   char *subr;
 169 {
 170   scm_error (scm_num_overflow_key,
 171              subr,
 172              "Numerical overflow",
 173              SCM_BOOL_F,
 174              SCM_BOOL_F);
 175 }
 176
 177 SCM_SYMBOL (scm_out_of_range_key, "out-of-range");
 178 void
 179 scm_out_of_range (subr, bad_value)
 180      char *subr;
 181      SCM bad_value;
 182 {
 183   scm_error (scm_out_of_range_key,
 184              subr,
 185              "Argument out of range: %S",
 186              scm_listify (bad_value, SCM_UNDEFINED),
 187              SCM_BOOL_F);
 188 }
 189
 190 SCM_SYMBOL (scm_args_number_key, "wrong-number-of-args");
 191 void
 192 scm_wrong_num_args (proc)
 193      SCM proc;
 194 {
 195   scm_error (scm_args_number_key,
 196              NULL,
 197              "Wrong number of arguments to %s",
 198              scm_listify (proc, SCM_UNDEFINED),
 199              SCM_BOOL_F);
 200 }
 201
 202 SCM_SYMBOL (scm_arg_type_key, "wrong-type-arg");
 203 void
 204 scm_wrong_type_arg (subr, pos, bad_value)
 205      char *subr;
 206      int pos;
 207      SCM bad_value;
 208 {
 209   scm_error (scm_arg_type_key,
 210              subr,
 211              (pos == 0) ? "Wrong type argument: %S"
 212              : "Wrong type argument in position %s: %S",
 213              (pos == 0) ? scm_listify (bad_value, SCM_UNDEFINED)
 214              : scm_listify (SCM_MAKINUM (pos), bad_value, SCM_UNDEFINED),
 215              SCM_BOOL_F);
 216 }
 217
 218 SCM_SYMBOL (scm_memory_alloc_key, "memory-allocation-error");
 219 void
 220 scm_memory_error (subr)
 221      char *subr;
 222 {
 223   scm_error (scm_memory_alloc_key,
 224              subr,
 225              "Memory allocation error",
 226              SCM_BOOL_F,
 227              SCM_BOOL_F);
 228 }
 229
 230 SCM_SYMBOL (scm_misc_error_key, "misc-error");
 231 void
 232 scm_misc_error (subr, message, args)
 233      char *subr;
 234      char *message;
 235      SCM args;
 236 {
 237   scm_error (scm_misc_error_key, subr, message, args, SCM_BOOL_F);
 238 }
 239
 240 /* implements the SCM_ASSERT interface.  */
 241 SCM
 242 scm_wta (arg, pos, s_subr)
 243      SCM arg;
 244      char *pos;
 245      char *s_subr;
 246 {
 247   if (!s_subr || !*s_subr)
 248     s_subr = NULL;
 249   if ((~0x1fL) & (long) pos)
 250     {
 251       /* error string supplied.  */
 252       scm_misc_error (s_subr, pos, SCM_EOL);
 253     }
 254   else
 255     {
 256       /* numerical error code.  */
 257       int error = (long) pos;
 258
 259       switch (error)
 260         {
 261         case SCM_ARGn:
 262           scm_wrong_type_arg (s_subr, 0, arg);
 263         case SCM_ARG1:
 264           scm_wrong_type_arg (s_subr, 1, arg);
 265         case SCM_ARG2:
 266           scm_wrong_type_arg (s_subr, 2, arg);
 267         case SCM_ARG3:
 268           scm_wrong_type_arg (s_subr, 3, arg);
 269         case SCM_ARG4:
 270           scm_wrong_type_arg (s_subr, 4, arg);
 271         case SCM_ARG5:
 272           scm_wrong_type_arg (s_subr, 5, arg);
 273         case SCM_WNA:
 274           scm_wrong_num_args (arg);
 275         case SCM_OUTOFRANGE:
 276           scm_out_of_range (s_subr, arg);
 277         case SCM_NALLOC:
 278           scm_memory_error (s_subr);
 279         default:
 280           /* this shouldn't happen.  */
 281           scm_misc_error (s_subr, "Unknown error", SCM_EOL);
 282         }
 283     }
 284   return SCM_UNSPECIFIED;
 285 }
 286
 287 /*  obsolete interface: scm_everr (exp, env, arg, pos, s_subr)
 288     was equivalent to scm_wta (arg, pos, s_subr)  */
 289
 290 void
 291 scm_init_error ()
 292 {
 293 #include "cpp_err_symbols.c"
 294 #include "error.x"
 295 }
 296